<div ng-controller="indexController">
    提问者<input type="text" ng-model="askUserId"><br>
    答主<input type="text" ng-model="answerUserId"><br>
    金额<input type="text" ng-model="amount"><br>
    内容<input type="text" ng-model="content"><br>
    <button ng-click="submit()">submit</button>
</div>